package filters;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class SetCharacterEncodingFilter
  implements Filter
{
  protected String encoding = null;

  protected FilterConfig filterConfig = null;

  protected boolean ignore = true;

  public void destroy()
  {
    this.encoding = null;
    this.filterConfig = null;
  }

  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
    throws IOException, ServletException
  {
    if ((this.ignore) || (request.getCharacterEncoding() == null)) {
      String encoding = selectEncoding(request);
      if (encoding != null) {
        request.setCharacterEncoding(encoding);
      }
    }
    
    String path=((HttpServletRequest)request).getServletPath();  
    if (((HttpServletRequest) request).getSession().getAttribute("userinfo") == null) {//session不存在需要拦截  
        String contextPath=((HttpServletRequest)request).getContextPath();  
//      System.out.println("ContextPath="+contextPath);  
        ((HttpServletResponse)response).sendRedirect(contextPath+"/login.jsp?toPath="+path);//记录下登录后需要跳转到的页面，比如：/logined/account.jsp  
    }else{  
        chain.doFilter(request, response);  
    } 

    chain.doFilter(request, response);
  }

  public void init(FilterConfig filterConfig)
    throws ServletException
  {
    this.filterConfig = filterConfig;
    this.encoding = filterConfig.getInitParameter("encoding");
    String value = filterConfig.getInitParameter("ignore");
    if (value == null)
      this.ignore = true;
    else if (value.equalsIgnoreCase("true"))
      this.ignore = true;
    else if (value.equalsIgnoreCase("yes"))
      this.ignore = true;
    else
      this.ignore = false;
  }

  protected String selectEncoding(ServletRequest request)
  {
    return this.encoding;
  }
}